What version the JVM is JIRA running on? What version of JIRA? Did this just start happening? Do you happen to know if this issue occurs for these clients in another browser, (Chrome, Firefox, etc.)?
My gut tells me that this is a Java incompatibility of some sort.
This isn't the exact error you're seeing, but give this workaround a try:
Also, this issue seems to be more related, but is currently marked as cannot reproduce.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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